from django.core.urlresolvers import reverse
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render, get_object_or_404
from django.template import RequestContext, loader
from django.views import generic
from polls.models import Poll, Choice


class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_poll_list'
    
    def get_queryset(self):
        """Return the last five published polls."""
        return Poll.objects.order_by('-pub_date')[:5]


class DetailView(generic.DetailView):
    template_name = 'polls/detail.html'
    model = Poll


class ResultsView(generic.DetailView):
    model = Poll
    template_name = 'polls/results.html'


def vote(request, poll_id):
    p = get_object_or_404(Poll, pk=poll_id)
    try:
        selected_choice = p.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the poll voting form.
        return render(request, 'polls/detail.html', {
            'poll': p,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        # Always return an HttpResponseRedirect after successfully dealing
        # with POST data. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))
    

# def index(request):
#     latest_poll_list = Poll.objects.order_by('-pub_date')[:5]
#     #template = loader.get_template('polls/index.html')
#     #context = RequestContext(request, {
#     #   'latest_poll_list': latest_poll_list,                                   
#     #})
#     #return HttpResponse(template.render(context))
#     context = { 'latest_poll_list': latest_poll_list }
#     return render(request, 'polls/index.html', context)
# 
# def detail(request, poll_id):
#     #try: 
#     #    poll = Poll.objects.get(pk=poll_id)
#     #except Poll.DoesNotExist:
#     #    raise Http404
#     poll = get_object_or_404(Poll, pk=poll_id)
#     return render(request, 'polls/detail.html', { 'poll': poll })
# 
# def results(request, poll_id):
#     poll = get_object_or_404(Poll, pk=poll_id)
#     return render(request, 'polls/results.html', {'poll': poll})
